Mold for making sewer-pipes.



A. J. BOYLE MOLD FOR MAKING SEWER PIPES.

APPLICATION FILED AUG. f8. 1915- v Patented Nov. 30, 1915.

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ALBERT J. BOYLE, 0F BALTIMORE, vIYIARYILAND.

MOLD FOR MAKING SEWER-PIPES.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed. August 18, 1915. Serial No. 46,094.

To all whom it may concern Be it known that I, ALBERT J. BOYLE, citizen of the United States, residing at Baltimore, Maryland, have invented certain new and useful Improvements in Molds for Making Sewer-Pipes, of which the following is a specification.

This invention relates to molds such as are used for casting sewer pipe and particularly the type having bell and spigot ends.

The object of the invention is to devise a cheap and eilicient mold for this type of sewer pipe ends and especially the particular pipe covered by my application numbered 27,680 and filed May 12,1915.

WVith this and other objects in view, the invention consists in the construction and arrangement and combination of parts here inafter described and particularlypointed out in the claims, it being understood that I do not intend to limit myself to the details of construction.

The invention has been illustrated in the accompanying drawings in which Figure 1 is a plan view of my mold for the bell end of the pipes. Fig. 2 is a side elevation of the device shown in Fig. 1. Fig. 3 is a partial sectional view of Fig. 2. Fig. 4 shows in section the bell and spigotends of the pipes made in these molds.

In Fig. 4 of the drawings, the numeral 1 indicates concrete sewer pipes provided with a spigot end 2 having an exterior annular groove 3 thereupon. 4 indicates a bell end on one of the pipes 1 adapted to be complementary to the spigot end 2, and also provided with an annular but interior groove 5. The grooves 3 and 5 are adapted to be superimposed so that an annular space is provided between the extending ends of the pipes, and the locking member may be inserted in the space 6. The mold of Figs. 1, 2 and 3 is devised for making the bell end 4 of the pipes. This mold consists of a truncated cone shaped portion 7 having a flanged base 8 which is recessed at 9, the recess being annular and extending between thebase of the cone 7 and the periphery of the flange 8. The top of the cone 7 has an inwardly extending flange 10 which is provided with a central circular opening 11 as seen in Fig. 1. The cone 7 has a series of recesses 12 of substantially wedge -shape on its periphery. Into these recesses 12 are adapted to fit wedges 13 which have secured to them sectional hoop members 14. These hoop sections have their ends cut diagonally at 15 but the ends of two are cut straight as at 16. When in place the hoop sections completely encircle the cone 7 and are held there around about midway of its height by means of the wedge 13 which are supported in the recesses 12. V

The operation of the molds is as follows:

When it is desired to cast the bell end of the.

pipe, the mold of Figs. 1 to 3 is added to the end of the usual tubular mold used for pipes. The interior member of the tubular mold will abut the flange 10 and the exterior tubular mold will engage the outer periphery of the recesss'9. The plastic material is then 7 inserted into the mold. It can be seen then that the hoop or rib 14 will cause the recess 5 to be formed in the bell end 4 of the pipe. After the material is hard, the mold of Figs. 1 to 3 is removed endwise. As' the hoop members 14 are held securely in the groove 5 of the pipe, when the mold is removed the recesses 12 will allow the mold to slide off from the wedges 13 so that the mold will be removed completely from the pipe but the hoop members 14 will remain with their wedges 13. As soon as the mold is removed, it is a simple matter to collapse the hoop sections 14 and remove them from the groove 5.

What I claim is 1. A mold comprising a base and a body portion extending therefrom, having a series extending around the bodv portion and hav- 3 mg transverse pro ect1ons extending into said recesses, saidbody portion and sectional band being removable one from the other, substantially as described. V

2. A mold of the class described having a hollow truncated cone shaped body portion provided with wedge shaped longitudinal recesses opening into one end of said body In testimony whereof, I aflix my signature portion, a sectional groove making member in. presence of two witnesses. extending around the body portion, and

means for removably supporting said mem- ALBILRT BOX ber on the body portion comprising laterally Witnesses:

extending wedges carried by said vmember L. VERNON MILLER,

adapted for engagement With said recesses. JAMES THOMAS, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

-Washington, I). C. 

